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Genetic studies on quantitative and quality traits of three way cross hybrids and evaluation of germplasmin maize (Zea mays L.)

KrishiKosh

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Title Genetic studies on quantitative and quality traits of three way cross hybrids and evaluation of germplasmin maize (Zea mays L.)
 
Creator B.P.Pradeepa
 
Contributor M.C.Wali
 
Subject Genetics and Plant Breeding
 
Description An experiment was conducted to analyse the magnitude of heterosis, combining
ability, nature of gene action, nature and extent of association between quantitative traits,
starch and oil in three way cross hybrids of maize. A line × tester mating design was obtained
by crossing 25 single cross lines with three testers (inbred lines). Besides, 80 germplasm lines
were also evaluated for starch and oil content in an another experiment.
Three way crosses exhibited significant variability for 15 characters analysed. The
variance ratios revealed that the predominance of non-additive gene action in the inheritance
of all the traits studied. The study on the combining ability revealed that the linex; SCP-1,
SCP-18 and the tester; P1 was found to be best general combiners. Regarding specific
combining ability, ARBMTH-3, ARBMTH-34 and ARBMTH-9 showed significant highest
SCA for grain yield and starch content, while ARBMTH-6, ARBMTH-26 and ARBMTH-61
showed highest SCA effects for soil content. The crosses; ARBMTH-3 for grain yield and
starch whereas ARBMTH-6 for oil showed the highest heterosis percentage.
Among 80 germplasm lines, CI-5, CM-500 and KDMI-18 were found to be the best
mean performers for yield, starch and oil content, respectively. Correlation and path analysis
studies indicated that plant height, ear length, number of kernel rows per plant, 100-grain
weight, grain yield per plant had strong association and directly affected by yield and starch
content, while yield and starch content showed negative correlation with oil content. From
this investigation, it is suggested to evaluate six hybrids viz., ARBMTH-3, ARBMTH-34,
ARBMTH-9, ARBMTH-7, ARBMTH-32 and ARBMTH-14 for yield and starch and the
crosses ARBMTH-6, ARBMTH-26, ARBMTH-61, ARBMTH-65 and ARBMTH-12 for oil
content.
 
Date 2016-10-24T16:30:04Z
2016-10-24T16:30:04Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81581
 
Format application/pdf
 
Publisher UAS, Dharwad